基于加权信号泄漏比的多小区协作波束成型算法

Multicell cooperative beamforming based on weighted signal-to-leakage ratios

为了减小多天线蜂窝通信系统中存在的小区间干扰,提出了基于加权信号泄漏比的多小区协作波束成型算法。该算法利用有用信号的均值对不同用户接收到的泄漏信号功率进行加权,之后各个小区独立设计并使用能够最大化加权信号泄漏比的波束。利用上下行信道的对偶性,得到了最优波束的闭式解。仿真结果表明:在不同的系统调度策略下,提出的基于加权信号泄漏比的多小区协作波束成型算法都可以在不影响用户公平性的基础上提高系统平均吞吐率,同时保持较低的实现复杂度。

This paper presents a multicell cooperative beamforming algorithm based on weighted signal-to-leakage ratios to reduce the inter-cell interference in multiple antenna cellular communication systems. In this algorithm,the leakage power received by each user is weighted by the average useful signal power that the user has received. The beamforming strategy is then independently designed to maximize the weighted signal-to-leakage ratio in each cell with the optimal beams obtained in closed form by utilizing uplink-downlink duality. Simulation results show that the algorithm improves the average throughput with low complexity for various scheduling schemes while guarantees unchanged user fairness.